div.global {
    position: relative;
    top: 150px;
    margin: 0px auto;
    width: 340px;
    height: 330px;
    padding: 40px 10px 20px 10px;
    border-style: solid;
    border-width: 3px 3px 3px 3px;
    border-color: #96C2F1;
    background-image: url(../image/calculator.png);
}
input.output {
    position: relative;
    margin: 0px auto 10px auto;
    padding: 0px;
    height: 40px;
    width: 333px;
    text-align: right;
    font-size: 30px;
    font-family: Arial, serif;
    border-radius: 5px;
    border-width: 2px;
    border-color: #A34F11;
}
button.button {
    height: 40px;
    width: 75px;
    margin: 5px;
    padding: 0px;
    text-decoration: none;
    background: #2F435E;
    color: #F2F2F2;
    font-size: 16px;
    font-family: 微软雅黑, Arial, Helvetica, sans-serif;
    font-weight: bold;
    border-radius: 5px;
    float: right;
}
div.footer {
    text-align: center;
    font-size: 15px;
    color: black;
    font-family: Times, serif;
    width: 100%;
    float: left;
    position: relative;
    top: 20px;
}